1/2 a^{v0,v1}_{a0,a1} b^{c0}_{v0} c^{a2}_{v1} a+(a0) a+(a1) a-(a2) a-(c0)
+a^{v0,v1}_{a0,a1} b^{c0}_{v0} c^{a2}_{v1} gamma1^{a1}_{a2} a+(a0) a-(c0)
-a^{v0,v2}_{a0,a1} b^{c0}_{v1} c^{a2}_{v2} gamma1^{a1}_{a2} a+(a0) a+(v1) a-(v0) a-(c0)
+a^{v0,v2}_{a0,a1} b^{c0}_{v2} c^{a2}_{v1} gamma1^{a1}_{a2} a+(a0) a+(v1) a-(v0) a-(c0)